Classification
320 - Political science
6
333 - Economics of land & energy
6
551 - Geology, hydrology & meteorology
363 - Other social problems & services
5
000 - Computer science, information & general works
4
330 - Economics
3
600 - Technology
3
700 - The arts; fine & decorative arts
3
900 - History & geography
3
140 - Specific philosophical schools
2
581 - Specific topics in natural history
2
620 - Engineering & allied operations
2
370 - Education
1
380 - Commerce, communications & transportation
1
414 - Phonology & phonetics
1
610 - Medicine & health
1
658 - General management
1
800 - Literature & rhetoric
1